I also can understand the urge not to kill a pet. It's part of how most American children are raised, but I've begun to have a shift in my philosophy toward it after seeing how disconnected many of us are from the natural order of things. I don't want to start a flaming match either, but I'm an unapologetic omnivore and that being the case, I recognize that some animals are going to be eaten by me. That goes extra for mean roosters and hens who eat their eggs. Not that I've had to resort to that yet, but one day I will.
If a person hadn't been raised by a mother who survived a war and a depression in what was then a third world country, I could see how taking a pet chicken to the vet and paying to have it euthanized and then burying it in the ground would make sense. But tell that to anyone who ever starved or anyone who was raised by anyone who starved. Think about how much an organically raised, grass-fed bird would cost at an ethical farm, which is really what the backyard is. Probably around $20 per chicken. Now tell an Ethiopian that you're going to buy that bird and bury it in a hole. Or, take a $20 bill and bury it in the backyard.
Everyone who said that it's unethical to rehome a mean rooster is probably right...it would take a special owner to keep that bird, and truth be told, it would end up in the soup pot anyhow. So if it were me, I'd eat that rooster myself. It reminds me of the time I was at my aunt's house for lunch. We were eating chicken and suddenly my aunt looked at my 4 year old cousin and said "What you're eating right now is that mean rooster that attacked you." My cousin nodded her head and chewed that drumstick with extra vigor. It's part of raising kids who understand where their food comes from.